Newton's Laws, Momentum & Speed Practice Questions

A person in a head-on collision, who is not wearing a seat belt, continues to move forward at the same speed of the car because of

• A) inertia

• B) friction

• c) weight

• D) gravity

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Newton' 1st Law of Motion states that an object at rest or moving at a constant speed in a

• A straight line

• B state of acceleration

• elliptical orbit

• D) curved path

The formula for Momentum (P) is used to help determine how hard it is to stop a moving object. The heavier the object the harder it is to stop. The formula for momentum is p= mv, where p= momentum, m= mass and v= velocity. The relationship between momentum and mass is

• A normal

• B) direct- as mass goes up, momentum goes up

• indirect-as mass goes up, momentum goes down

• D cannot be determined without more information

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If a 300 N action force is exerted to the right, the reaction force will be (Remember: Newton's 3rd Law!)

• A) 300 N to the right

• B) 600 n to the right

• c) 300 N to the left

• D) 600 N to the left

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Newton's 3rd Law of Motion can be stated as "For every action there is a(n)

• A equal and identical

• equal and opposite

• C stronger and opposite

• D weaker and opposite

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Newton's 2nd Law of Motion states that an object acted upon by a net force will accelerate in the direction of the force according to the equation

• A

• B

• D

• C v= at

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A real car moving at 10 km/h has more momentum than a toy car moving at the same rate because

• A its mass is greater

• its mass is less

• reaction."

• it moves faster

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battery-powered cart pulls an 800-gram load across the floor. If the load were reduced to 400 grams, and the force used to move the cart remained the same, the cart would

• A move slower

• B move faster

• D move at the same speed

• move at the same speed

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NGSS.MS-PS2-2

A passenger is in a car that collides with another car. The passenger would continue in a forward motion but they were wearing a seat belt. The seat belt helps to protect the passenger and prevent injuries by applying a force that is:

• A less than the force of the moving passenger

• B in the same direction as the car's motion

• greater than the force of the moving car

• D in the opposite direction of the passenger's motion

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A heavyweight boxer winds up and punches a punching bag. Which of the following are true?

• A The punching bag exerts more force than the fist.

• B The fist exerts more force than the punching bag.

• c The force acting on the bag is equal and opposite to the force acting on the fist.

• D The fist creates the action force and the punching bag creates the reaction force.

• E There is no force between the two objects because they are balanced.

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